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Loans - Credit risk profile by risk grade of non acquired loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Loans |  |
Total loans | $ 11,375,104 | $ 11,290,147
Construction and land development |  |
Loans |  |
Total loans | 1,017,261 | 1,025,387
Other income producing property |  |
Loans |  |
Total loans | 346,554 | 361,879
Consumer Owner Occupied Loans |  |
Loans |  |
Total loans | 2,706,960 | 2,760,126
Other loans |  |
Loans |  |
Total loans | 13,892 | 1,457
Commercial loans | Commercial non-owner occupied |  |
Loans |  |
Total loans | 2,323,967 | 2,357,730
Commercial loans | Commercial and industrial |  |
Loans |  |
Total loans | 1,386,327 | 1,261,527
Consumer | Home equity loans |  |
Loans |  |
Total loans | 758,020 | 773,363
Consumer | Consumer |  |
Loans |  |
Total loans | 663,422 | 654,883
Non-acquired loans |  |
Loans |  |
Total loans | 9,252,831 | 8,928,512
Non-acquired loans | Pass |  |
Loans |  |
Total loans | 9,123,097 | 8,808,623
Non-acquired loans | Special mention |  |
Loans |  |
Total loans | 83,830 | 66,929
Non-acquired loans | Substandard |  |
Loans |  |
Total loans | 45,904 | 52,960
Non-acquired loans | Construction and land development |  |
Loans |  |
Total loans |  | 955,318
Non-acquired loans | Commercial non-owner occupied |  |
Loans |  |
Total loans |  | 1,777,327
Non-acquired loans | Commercial owner occupied real estate loan |  |
Loans |  |
Total loans |  | 1,677,695
Non-acquired loans | Commercial and industrial |  |
Loans |  |
Total loans |  | 1,130,847
Non-acquired loans | Other income producing property |  |
Loans |  |
Total loans | 218,617 | 220,957
Non-acquired loans | Consumer Owner Occupied Loans |  |
Loans |  |
Total loans |  | 2,118,127
Non-acquired loans | Home equity loans |  |
Loans |  |
Total loans |  | 521,744
Non-acquired loans | Consumer |  |
Loans |  |
Total loans |  | 525,040
Non-acquired loans | Other loans |  |
Loans |  |
Total loans | 13,892 | 1,457
Non-acquired loans | Commercial loans |  |
Loans |  |
Total loans | 6,062,991 | 5,762,144
Non-acquired loans | Commercial loans | Pass |  |
Loans |  |
Total loans | 5,971,069 | 5,682,855
Non-acquired loans | Commercial loans | Special mention |  |
Loans |  |
Total loans | 69,268 | 52,081
Non-acquired loans | Commercial loans | Substandard |  |
Loans |  |
Total loans | 22,654 | 27,208
Non-acquired loans | Commercial loans | Construction and land development |  |
Loans |  |
Total loans | 968,360 | 955,318
Non-acquired loans | Commercial loans | Construction and land development | Pass |  |
Loans |  |
Total loans | 959,206 | 947,230
Non-acquired loans | Commercial loans | Construction and land development | Special mention |  |
Loans |  |
Total loans | 7,095 | 5,601
Non-acquired loans | Commercial loans | Construction and land development | Substandard |  |
Loans |  |
Total loans | 2,059 | 2,487
Non-acquired loans | Commercial loans | Commercial non-owner occupied |  |
Loans |  |
Total loans | 1,811,138 | 1,777,327
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Pass |  |
Loans |  |
Total loans | 1,787,306 | 1,768,013
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Special mention |  |
Loans |  |
Total loans | 22,410 | 7,091
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Substandard |  |
Loans |  |
Total loans | 1,422 | 2,223
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan |  |
Loans |  |
Total loans | 1,784,017 | 1,677,695
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Pass |  |
Loans |  |
Total loans | 1,754,801 | 1,648,456
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Special mention |  |
Loans |  |
Total loans | 19,742 | 17,319
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Substandard |  |
Loans |  |
Total loans | 9,474 | 11,920
Non-acquired loans | Commercial loans | Commercial and industrial |  |
Loans |  |
Total loans | 1,280,859 | 1,130,847
Non-acquired loans | Commercial loans | Commercial and industrial | Pass |  |
Loans |  |
Total loans | 1,256,465 | 1,103,532
Non-acquired loans | Commercial loans | Commercial and industrial | Special mention |  |
Loans |  |
Total loans | 16,055 | 18,148
Non-acquired loans | Commercial loans | Commercial and industrial | Substandard |  |
Loans |  |
Total loans | 8,339 | 9,167
Non-acquired loans | Commercial loans | Other income producing property |  |
Loans |  |
Total loans | 218,617 | 220,957
Non-acquired loans | Commercial loans | Other income producing property | Pass |  |
Loans |  |
Total loans | 213,291 | 215,624
Non-acquired loans | Commercial loans | Other income producing property | Special mention |  |
Loans |  |
Total loans | 3,966 | 3,922
Non-acquired loans | Commercial loans | Other income producing property | Substandard |  |
Loans |  |
Total loans | 1,360 | 1,411
Non-acquired loans | Consumer |  |
Loans |  |
Total loans | 3,189,840 | 3,166,368
Non-acquired loans | Consumer | Pass |  |
Loans |  |
Total loans | 3,152,028 | 3,125,768
Non-acquired loans | Consumer | Special mention |  |
Loans |  |
Total loans | 14,562 | 14,848
Non-acquired loans | Consumer | Substandard |  |
Loans |  |
Total loans | 23,250 | 25,752
Non-acquired loans | Consumer | Consumer Owner Occupied Loans |  |
Loans |  |
Total loans | 2,118,839 | 2,118,127
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Pass |  |
Loans |  |
Total loans | 2,094,080 | 2,091,129
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Special mention |  |
Loans |  |
Total loans | 9,585 | 9,054
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Substandard |  |
Loans |  |
Total loans | 15,174 | 17,944
Non-acquired loans | Consumer | Home equity loans |  |
Loans |  |
Total loans | 518,628 | 521,744
Non-acquired loans | Consumer | Home equity loans | Pass |  |
Loans |  |
Total loans | 508,054 | 510,508
Non-acquired loans | Consumer | Home equity loans | Special mention |  |
Loans |  |
Total loans | 4,490 | 5,373
Non-acquired loans | Consumer | Home equity loans | Substandard |  |
Loans |  |
Total loans | 6,084 | 5,863
Non-acquired loans | Consumer | Consumer |  |
Loans |  |
Total loans | 538,481 | 525,040
Non-acquired loans | Consumer | Consumer | Pass |  |
Loans |  |
Total loans | 536,002 | 522,674
Non-acquired loans | Consumer | Consumer | Special mention |  |
Loans |  |
Total loans | 487 | 421
Non-acquired loans | Consumer | Consumer | Substandard |  |
Loans |  |
Total loans | 1,992 | 1,945
Non-acquired loans | Consumer | Other loans |  |
Loans |  |
Total loans | 13,892 | 1,457
Non-acquired loans | Consumer | Other loans | Pass |  |
Loans |  |
Total loans | $ 13,892 | $ 1,457

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